Device for tensioning metal binding strips for packages and the like



THE LIKE O. KIND A ril 18, 1939.

DEVICE FOR TENSIONING METAL BINDING STRIPS FOR PACKAGES AND Filed May 21, 1937 3 Sheets-Sheet -l April 18, 1939. o. KIND 2,154,851

DEVICE FOR TENSIONING METAL BINDING STRIPS FOR PACKAGES AND THE LIKE Filed May 21, 1937 3 Sheets-Sheet 2 'April 18, 1939. O KlND 2,154,851 DEVICE FOR TENSIONING METAL BINDING STRIPS FOR PACKAGES AND THE LIKE Filed May 21, 1937 3 Sheets-Sheet 3 Patented Apr. 18, 1939 7 2,154,851

UNITED STATES PATENT OFFICE DEVICE FOR TENSIONING METAL BINDING STRIPS FOR PACKAGES AND THE LIKE Oscar Kind, Rodenkirchen, near Cologne, Germany Application May 21, 1937, Serial No. 144,101 In Germany March 20, 1937 2 Claims. (01. 25476) This invention relates to devices for tensioning construction of the tensioning device according metal binding strips for packages and the like to the invention in which: and in particular to a device of this type which Fig. 1 shows by way of example the tensioning can be used in combination with one of the many device in combination with a twisting device, in common devices which serve to produce the fasfront elevation, as generally used in a similar 5 tening for such bindings produced with a wire way for the production of wire bindings,

or flat strip and the subject of the application Fig. 2 shows a corresponding plan view, relates to the known tensioning devices used for Fig. 3 shows on a larger scale the essential such purposes, in which the tensioning of the parts of the tensioning device itself in front elestrips is effected by means of two automatic vation, .lO clamping devices which can alternately be moved Fig. 4-. is a sectional elevation on the line towards each other and away from each other IVIV of Fig. 3, through the actuation of a hand lever and which Fig. 5 is a vertical section on the line VV act on the end of the strip to be tensioned in of Fig. 3,

'15 such a way that they allow the strip to pass Fig. 6 illustrates schematically the method of freely into the tensioning device between the operation of the device. clamping surfaces whilst retaining it in the op The common base plate I of the tensioning posite direction. and fastening device, which is. placed on the In the previously known tensioning devices of package to be bound up, carries in the centre this kind one of the two tensioning clamps is part of its front edge the fastening device which 20 fixedly disposed so that it only serves as a stop is operated by swinging the fastening handle 2 clamp for retaining the strip during the return backwards and forwards in conjunction with the movement of the second clamp actuated by the toothed wheels 3 and two twisting pinions 4. On hand lever. The hand lever must thus make a the left side of the twisting device there is profree stroke between each tensioning stroke, in vided a clamping eccentric 5, serving to retain 25 order to bring the movable clamp again into the one end of the binding strip 35 (Fig. 6) at the operative position. level of the axle of the twisting pinions 4 and Contrary to this, in the subject of the applicawhich is disposed in such a way that in the tion, both tensioning clamps are movably disknown manner it can be operated, by means of posed and are connected with the hand lever in its hand lever 6, about a horizontal axis above 30 such a way that they are moved towards each the supporting surface 1. other on swinging the hand lever in one direction On the opposite side of the fastening device and away from each other on moving the hand the tensioning device is disposed on a guiding lever in the other direction. In this way one block 8 united with the base plate I on whose of the two tensioning clamps acts to advance front vertical surface parallel to the edge of the 35 the strip each time in the direction of the tenbase plate and the s of the tw t n p n ns sioning, whilst the other clamp moves backwards there are disposed two longitudinally displaceable from the direction of tensioning. By utilizing slid-e5 H between the two parallel guiding in this way both strokes of the tensioning lever members i Slides are provided with thrust 40 to promote the tensioning a considerable saving fi g i 5; so arranged a fi y 40 in time is effected. Moreover, this method of g er m e fg ig g operation simplifies the diminution of the sepal5 g f ig z igggg i g w fi 231 23131332 222321?if?tiifitltJTFTdfiffi' extent mm which Prank-Pins pene- 4 stages In this way it is easier for the opera e? g i i g i g ff s plate shaped r 'en ar 0 e orlzon a ensionin lev r to effect alterations in the tensioning force proaxle 9 This lever axle rests i b i in duced than if larger tensioning stages were used, lying on the rear Side of t guiding block 3 s p l y pauses for free StTOkeS- The and carries at its rear end the tensioning lever ven ionb hu no nlylfi ilf g ghb ip f liw 2|. By the oscillation of the latter from left to 1 0 9 more 1 3 e 60 e 51 a 5 right and vice versa the two slides l0 and H can possible amore uniform and accurate regulation therefore be moved simultaneously in opposite diof Eh? peripherall1 tensiorlio of till-3;:1 septaratle bindings. rectlons and alternately to and from each other e erence W1 now e ma e o e accomby means of the two crank pins I6, ll. 5 panying drawings which illustrate one form of On the front surface of each of the two slides 55 H], II between each pair of retaining members 22 guiding their edges, there is provided a horizontally projecting carrying pin 23 on which rests a holding plate 24 which is fixed against rotation by means of projections 25 thereon engaging in slots 26 of the respective slide body. Each plate 24 carries at its lower edge a horizontally projecting plate 2? which acts as a buttress for the clamping action of the eccentric pawl 28 which is rotatably disposed in front of the holding plate 24 on the carrying pin 23. The two eccentric pawls are somewhat longer than the distance between the axis of the carrying pin and the surface of the buttress plate 27. They are both obliquely disposed with the same inclination towards the right so that they can both swing out in the direction of the tensioning movement away from the fastening device whilst the opposite movement is limited by contact with the anvil plate.

In front of the eccentric pawls 28 a lift part 29 is provided on each of the two carrying pins 23 so that an angle member 29 thereof overlies the upper end surface of the eccentric pawl 28 so that this lift part 29 must also make the oscillating movements of the eccentric pawl 28. The lift part is provided at its rectangular end edge with a forwardly projecting lifting arm 3|, whose lower end 32 projects slightly beyond the rectangular edge of the buttress plate 21. The front edge of this lifting arm is constructed as a backwardly and downwardly inclined cam surface 33 which projects to such an extent that, with the counterpressure of the end of the wire or strip 35 of the binding to be tensioned, by the action of this oblique surface the lift part 29 together with the eccentric pawl 28 is raised towards the right and the clamp is thereby opened, so that the end of the binding wire on the other side of the pointed end 32 of the lifting arm 3| can enter between the buttress plate 21 and the end of the eccentric pawl 28 and be fixed by this. In front of the lift part 29 a helical spring 34 is provided on the front end of the carrying pin 23 in such a way that through its outer free end the lift part 29 and accordingly the eccentric pawl 28 is pressed downwards against the buttress plate 21. While the binding wire can raise the lift part 29 by the cam action induced by the engagement of said wire with the cam surface 33, it is obvious that this same cam action does not occur once the wire is inside or rearwardly of the part 29. The hook-shaped end of part 29 operates to prevent the part 29 from being raised by the wire and the part 29 thereby constitutes a keeper toretain the wire in position on the buttress plate 21.

When operating the device the extreme end of the binding wire 35, as can be seen from Fig. 6, is drawn in between the clamp eccentric and its supporting surface 1 by operation of the hand lever 6. After guiding the binding wire 36 around the package and guiding back its tensioning end 31 the latter is placed on the edges of the buttress plates 21 laterally in front of the cam surfaces 33 of the two clamping devices and is pressed against the lifting arm 3| so that it rises and the end of the wire drops in between the buttress plate and the eccentric pawl which has thus been raised.

If the hand lever 2| is then swung outwards in the direction of the arrow 38 the two slides II], II will then be drawn towards each other in the direction of the arrows 39. In this way the clamp on the left side takes along the wire clamped between its eccentric pawl and its buttress plate in the direction of the tensioning movement, whilst the eccentric pawl conveys the other clamp freely over the wire which has thus been drawn forwards. In the opposite swinging movement of the lever the two clamps move away from each other, the clamp on the right side acting in the direction of the tensioning whilst the left hand clamp makes its free stroke.

It is apparent from the foregoing that the device has a double action and that tightening is achieved irrespective of the direction in which the lever 2| is swung.

Instead of being used with wires the device can obviously be used for tensioning more or less broad iron binding strips, by means of a suitable widening of the eccentric pawls. Naturally in this case other auxiliary means must be used instead of a twisting device in order to effect the mechanical union of the two overlapping ends of the strip.

I claim:

1. In a tie tensioning device including a stationary gripping member for gripping one bight of said tie and movable gripping means for gripping the opposite bight of said tie; said movable means comprising a pair of reciprocal gripping members each of which is adapted to grip and tension said second bight when said member is moved in one direction and to release said second bight when moved in the opposite direction, a rock shaft, means for rocking said shaft, one end face of said shaft being disposed adjacent both of said gripping members, diametrically opposed crank pins on said end face of said shaft, integral extensions of said gripping members, and each of said pins being operatively connected to one of said extensions whereby rocking of said shaft in one direction moves one of said gripping members in a gripping direction and rocking of said shaft in the opposite direction moves the other gripping member in the gripping direction.

2. In a tie tensioning device including a stationary gripping member for gripping one bight of said tie and movable gripping means for gripping the opposite bight of said tie; said movable means comprising a pair of reciprocal gripping members each of which is adapted to grip and tension said second bight when said member is moved in one direction and to release said second bight when moved in the opposite direction, a rock shaft, means for rocking said shaft, one end face of said shaft being disposed adjacent both of said gripping members, diametrically opposed crank pins on said end face of said shaft, integral extensions of said gripping members, and each of said pins being operatively connected to one of said extensions whereby rocking of said shaft in one direction moves one of said gripping members in a gripping direction and rocking of said shaft in the opposite direction moves the other gripping member in the gripping direction, and a movable keeper pivotally connected to each of said movable gripping members, each of said keepers comprising an outer cam surface engageable with said second bight and thereby effective to raise said keeper and permit the positioning of said bight beneath said gripping member, said keeper including means for thereafter maintaining said bight beneath said gripping member.

OSCAR KIND. 

